All plugins: Username+Password via Environment Variables

[markuslf]

Describe the solution you'd like

Extend any plugins that ask for username and password by trying to read them from environment variables first.

Additional context

No response

[markuslf]

Let's have a look at how mydumper/myloader handles this.

[slalomsk8er]

Have a look at https://stackoverflow.com/a/10551190.